After the death of Abu Bakr Siddique, the second caliph to succeed him was Hazrat Umar Farooq, who period of caliphate was the longest amongst all four caliphs. Not only the longest but also the most successful, during which the Muslim nation prospered and thrived under their phenomenal leader and Islam spread by leaps and bounds to far off lands.

Who Were The Major Four Caliphs In Islamic History Who Succeeded The...